Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1980__172_172964, author = {Roland Derndinger}, title = {\"Uber das {Spektrum} positiver {Generatoren.}}, journal = {Mathematische Zeitschrift}, pages = {281--293}, publisher = {mathdoc}, volume = {172}, year = {1980}, zbl = {0444.47030}, url = {http://geodesic.mathdoc.fr/item/MZ_1980__172_172964/} }
Roland Derndinger. Über das Spektrum positiver Generatoren.. Mathematische Zeitschrift, Tome 172 (1980), pp. 281-293. http://geodesic.mathdoc.fr/item/MZ_1980__172_172964/